题目:
There is a common belief among the students in our school ______ they should make great efforts to learn and reach the peak of their academic performances.
A.which
B.if
C.that
D.whether
答案:
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答案:C题目分析:分散系的根本区别在于分散质微粒直径的大小不同,小于100nm为溶液,大于100nm为浊液,在1nm~100nm的为胶体,胶体具有的性质主要有;均一、稳定、有吸附作业,具有丁达尔现象、聚沉、电泳等性质...